# On black cores and degassing: analyzing a defect

Page: https://stenobird.com/podcast/apparently-invisible-chemistry-in-ceramics-5864808/on-black-cores-and-degassing-analyzing-a-defect
Text version: https://stenobird.com/podcast/apparently-invisible-chemistry-in-ceramics-5864808/on-black-cores-and-degassing-analyzing-a-defect.md
Podcast: [Apparently invisible. Chemistry in ceramics.](https://stenobird.com/podcast/apparently-invisible-chemistry-in-ceramics-5864808)
Published: 2025-12-04T03:30:07+00:00
Episode link: https://www.spreaker.com/episode/on-black-cores-and-degassing-analyzing-a-defect--68851793
Audio file: https://api.spreaker.com/download/episode/68851793/zs_64_en.mp3
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JSON: https://stenobird.com/v1/public/podcasts/apparently-invisible-chemistry-in-ceramics-5864808/episodes/on-black-cores-and-degassing-analyzing-a-defect
Duration seconds: 569

## Resource

This episode provides a quick overview of the “black core” effect—an internal discoloration in porcelain tiles, typically caused by incomplete oxidation of the ceramic body due to trapped organic residues. It highlights the production conditions that make the defect more likely to appear and then outlines practical corrective strategies to prevent it. All in just ten minutes.

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## Transcript

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